This dataset provides mass concentrations of particulate iodine as measured by the High-Resolution Aerosol Mass Spectrometer (HR-AMS) during the first two deployments of the NASA Atmospheric Tomography Mission (ATom) airborne campaigns 1 and 2 in 2016 and 2017. The data result from a reanalysis of the initial HR-AMS data based on post-mission calibrations and are reported at a 1-minute resolution. The dataset also includes the fractions of the main ions (I+, HI+, and I2+) that can be used to ascertain the oxidation state of iodine in particles. Each observation includes an air mass classification flag (tropospheric or stratospheric conditions) based on collocated in situ water vapor and ozone measurements and positional data from the HR-AMS data feed. These data will be used to evaluate the contribution of particulate iodine to the total halogen budget in the lower stratosphere and its implications for ozone depletion.
ATom was a NASA Earth Venture Suborbital-2 mission. It studied the impact of human-produced air pollution on greenhouse gases and on chemically reactive gases in the atmosphere. ATom deployed an extensive gas and aerosol payload on the NASA DC-8 aircraft for systematic, global-scale sampling of the atmosphere, profiling continuously from 0.2 to 12 km altitude. Flights occurred in each of 4 seasons over a 4-year period. See all ORNL DAAC data from ATom.
Data Citation: Jimenez, J.L., P. Campuzano-Jost, D.A. Day, B.A. Nault, and J.C. Schroder. 2020. ATom: L2 Particulate Iodine from High-Resolution Aerosol Mass Spectrometer (HR-AMS). ORNL DAAC, Oak Ridge, Tennessee, USA. https://doi.org/10.3334/ORNLDAAC/1773